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COM Port Connectors
The EITX-3000 board provides four D-Sub 9-pin connectors as
COM 1, COM 2, COM 3 and COM 4 serial communications.
COM 1 and COM 2 ports
The EITX-3000 provides two D-Sub 9-pin connectors as COM 1
and COM 2 for RS-232/422/485 serial communications.
RS-232
Pin
Signal
1
DCD
2
RxD
3
TxD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
The default setting of COM 1 and COM 2 is RS-232, both COM 1
and COM 2 can be configured to operate in RS-232, RS-422 or RS-
485 mode by adjusting the BIOS setup items of "COM1 RS-
232/422/485 Type" and "COM2 RS-232/422/485 Type" in "Super
I/O COM Ports (UARTS)" of "Super I/O Device" of "Integrated
Peripherals" section at Award BIOS setup.
RS-422
RS-485
Signal
Signal
Tx-
DATA-
Tx+
DATA+
Rx+
NC
Rx-
NC
GND
GND
NC
NC
NC
NC
NC
NC
NC
NC
14
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